Maternal grandfather of the composer (b. 26 December 1778 at Meissen, Saxony; d. 23 June/5 July 1835 in Saint Petersburg), born Michael Heinrich Maximilian Acier, but known in Russia as Andrey Mikhaylovich Assier (Андрей Михайлович Ассиер).
He was the son of Michel Victor Acier and his wife Maria Christina Eleonora (b. Wittig), and was brought to Russia in 1795 as a teacher of German and French for the Saint Petersburg Military School by the Russian general Pyotr Melissino. In 1800, by an oath of allegiance, Heinrich officially became a subject of the Imperial Crown and adopted the Russian name "Andrey Mikhaylovich Assier". He later served as a Customs and Ministry of Finances official, and was awarded the Order of Saint Vladimir (4th Class) and the Order of Saint Anne (2nd Class).
In 1800 he married for the first time to Yekaterina Popova (1778–1816), and they had five children — Mikhail (b. 1802); Yekaterina (1805–1882); Nikolay (b. 1809); Andrey (b. 1811); and Aleksandra (1812–1854), mother of the composer.
After his first wife's death in 1816 he married Amalia Grigoryevna Gogel, by whom he had two more children — Yelizaveta (b. 1823), and Pavel (b. 1824).
- ['The attestation certificate of A. M. Assier'] (1983).
- Tamara Skvirskaya, ‘Quellen zur Biographie Andrej Michajlovič Assiers in Sankt Petersburger Archiven' (‘Sources for the biography of Andrey Mikhaylovich Assier in Saint Petersburg archives'), in: Lucinde Braun (ed.), Petr Ilič Čajkovskij – Michel Victor Acier. Eine Künstlerfamilie zwischen Sachsen und Russland (Pyotr Ilyich Tchaikovsky – Michel Victor Acier. An artistic family between Saxony and Russia) [= Čajkovskij Studien (14)] (Schott: Mainz, 2013).